Improvement in elevators



W. K. MARVIN.

ELEVATOR.

Patented-Sept.19,1876.

Java/W 1 N.PEYF.RS. PHOTO LTROGRAPH WASHINGTON n C NI'IED STATES PATENTWALTER K. MARVIN, on NEW YORK, N Y.

IMPROVEMENT IN ELEVATORS.

Specification forming part of Letters Patent No. 182,280, datedSeptember 19, 1876; application filed August 12, 1876.

To all whom it may concern:

Be it known that I, WALTER K. MARVIN, of the city, county, and State ofNew York,

have invented certain new and useful Improvements in Elevators, of whichthefollowing is a specification:

In Letters Patent No. 109,331, dated November 15, 1870, I have describedand claimed an elevator in which are combined a car balance-box, weight,and means for transferring.

as a weight, I now propose to use a liquidsuch as water-which may betransferred from balance-box to balance-box, or from balanceboX to car,or vice versa, as desired.

In using the phrase from balance-box to balance-box I mean to indicatethat in lieu of applying the weight in one direction direct- 'ly to thecar, as in my former Letters Patent,

this weight may be carried by a second balance-box, connected with thecar in such manner as to operate to move the car in a direction oppositeto that in which the other balance-box operates, which would, in effect,be equivalent to directly weighting the car itself.

I have indicated in the accompanying drawing one way in which myinvention may be carried into effect.

Figure l is a diagram representing so much of an elevator as needed toillustrate my invention. Fig. 2 is a sectional plan, on an enlargedscale, showing the arrangement of the valves.

A is the car, movable vertically in suitable guides, suspended by arope, to, which passes over a pulley, b, and is attached to thebalancebox B, which also is movable vertically in suitable guides. .Inthis case the car-itself is provided with a suitable tank, 6, to receivethe water needed to overbalance the weight represented in thebalance-box B. O is a pump, operated by any suitable power. From one endof the pump-cylinder leads a pipesection, 0, which connects with theforce side -c d enter the shells D E.

der seats or shells D E branch two pipes, f v g and h t, eachset beingequidistant from the point where their respective intermediatepipes VThe pipe fof the valve D and the'pipe h of valve E converge and mergeinto one pipe, j. In like manner the pipes g 'i converge and merge intoone pipe, it; Each valve D or E is a two-way valve, whose communicatingports Z are separated by a distance equal to that which separates eachintermediate pipe 0 d from either of its branch pipes fg or' it i. Thevalves are to be so connected and geared that, when the valve D isturned to bring its pipes cg into communication, the valve E will beturned to bring the pipes d h into communication. into pipe k, whichcommunicates, through flexible tubing is, with the tank on the car. Pipehleadsir1topipej,which communicates,through flexible tubing j with thebalance-box. Supposing, therefore, the tank and balance-box to-containwater, and the pump to be in op eration, the result'of thisposition ofthe valves would be to draw the water from the balancebox, and to forceit into the tank on the car, thus decreasing the weight of the former,and increasing the weight of the latter. On the other hand, reverse theposition of the valves, which can be done by giving them about aquarter-turn in the other direction, so as to put 0 in communicationwith f, and d with t. This will have the effect of drawing water fromthe tank on the car, .and forcing it into the balance-box.

The transfer of water can at any time be arrested entirely by giving thevalves about one-eighth of a turn, bringing its ports-opposite the solidsides of their seats intermediate between the-openings therein.

The valves are to be connected with, and operated by, a handrope,arranged with relation to the car similarly to the hand-rope in mybefore-mentioned Letters Patent, as will be understoodwithout furtherexplanation. I

also propose to use a brake substantially in the way indicated in mysaid Letters Patent.

1 have indicated one way in which my in- Pipe 9 leads vention may becarried into effect. It is manifest, however, that the arrangement andconstruction of the connections may be varied considerably withoutdeparture from my invention.

What I claim, and desire to secure by Letters Patent, is-

In an elevator in'which the car is caused to ascend and descend by theshifting of a weight, as described, the combination of the balancebox orreservoir, the counter-balance reservoir,

either on the car or in a separate box, conduits connecting saidreservoirs, and a forcing apparatus adapted to transfer the liquidthrough said conduits from one to the other of the reservoirs, thecombination being andacting as set forth. 1

In testimony whereof I have hereunto signed my name this 7th day ofAugust, A. D. 1876.

WALTER K. MARVIN. Witnesses:

B. F. LEE, A. PoLLoK,

